Protection from automatic generation of titles using curve\92s titles is added. Before this protection user could specify the titles manually using \93Plot 2d View Settings\94 dialog box. There was situation when titles generated automatically in updateTitles method and user lost his changes. Now there are myTitleAutoGeneration, myXTitleAutoGeneration, myYTitleAutoGeneration fields. They are true by default but if user changes titles they becomes true and automatic generation is not performed. Also corresponding methods for setting/getting these fields are added. Signal titleChangedByUser( const int theObjectType ) added too.
